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Robert Johnston — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Robert Johnston across the 1910, 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Harry & Anna — first a son (b.~1909), then head of a 2-person household.
Age 31
b. ~1909
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Vacuum Cleaner Factory |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 62 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Draftsman |
| Township / Ward | Chicago |
| Est. Birth Year | ~1909 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Anna Johnston | Head | — | 63 | ~1877 |
| Robert Johnston | Son | — | 31 | ~1909 |
Census Appearances
1910
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert G |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1920
Cook, Illinois
Son, age 11
Cook, Illinois · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert A. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 21
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | Salesman |
| Industry | Brush |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 31
Cook-County, Illinois · implied b. ~1909 — 2 household members
| Surname | Johnston |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Draftsman |
| Industry | Vacuum Cleaner Factory |
| Class of Worker | PW |
| Hours Worked | 37 |
| Income (1939) | 62 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Robert Johnston across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Harry Johnston (~0.92 confidence) and mother Anna Johnston (~0.92 confidence) and mother Anna Johnston (~0.92 confidence) and mother Annie Johnston (~0.92 confidence) and mother Emma Johnston (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Harry Johnston
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Anna Johnston
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Anna Johnston
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Annie Johnston
b. ~1877
Source mother
● Household
· direct · ~0.92
Mother
Emma Johnston
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Johnston
Son · 1940 · age 31 · b. ~1909 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01015-00594)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Eleanore Mcnamara | 14 | Daughter | — | Illinois |
| 42 | Katherine Mcnamara | 9 | Daughter | — | Illinois |
| 43 | Patricia Mcnamara | 8 | Daughter | — | Illinois |
| 44 | John J. Mcnamara | 67 | Father | — | Illinois |
| 45 | John Barrett | 44 | Head | Electrical Engineer | New York |
| 46 | Rena Felger | 73 | Lodger | — | Ohio |
| 47 | Emma Crumbly | 86 | Lodger | — | Ohio |
| 48 | Ferdinand Mikitka | 38 | Head | Electrical Line Man | Austria |
| 49 | Emma Mikitka | 37 | Wife | — | Illinois |
| 50 | Lois Mikitka | 11 | Daughter | — | Illinois |
| 51 | Robert Mikitka | 3 | Son | — | Illinois |
| 52 | William O'Neill | 76 | Head | Checker | Kentucky |
| 53 | Therese O'Neill | 58 | Wife | — | Canada |
| 54 | George Bonn | 64 | Lodger | Distributor | Illinois |
| 55 | Oscar St. John | 50 | Head | Electrician | Illinois |
| 56 | Katherine St. John | 46 | Wife | — | Illinois |
| 57 | John Popp | 30 | Head | Barber | Roumania |
| 58 | Margaret Popp | 28 | Wife | — | Illinois |
| 59 | John Jr. Popp | 3 | Son | — | Illinois |
| 60 | Charles Kerr | 56 | Head | Caretaker Janitor | Illinois |
| 61 | Edith Kerr | 47 | Wife | — | Illinois |
| 62 | Robert Kerr | 24 | Son | Camera Examiner | Illinois |
| 63 | Margery Kerr | 21 | Daughter | Stenographer | Illinois |
| 64 | Anna Johnston | 63 | Head | — | Wisconsin |
| 65 | Robert Johnston THIS PERSON | 31 | Son | Draftsman | Illinois |
| 66 | Richard Williamson | 85 | Head | — | England |
| 67 | Margaret Williamson | 90 | Wife | — | Wales |
| 68 | John E. Coe | 59 | Head | School Teacher | Kansas |
| 69 | Lawrence Coe | 32 | Son | Inspector | Kansas |
| 70 | Lillian Coe | 26 | Daughter | — | Wisconsin |
| 71 | Jack Coe | 6 | Grandson | — | Illinois |
| 72 | Kenneth Coe | 27 | Son | Biologist | Kansas |
| 73 | John Halverson | 59 | Head | Machinist | Wisconsin |
| 74 | Kathleen Halverson | 43 | Wife | — | Wisconsin |
| 75 | Alice Halverson | 24 | Daughter | Junior Clerk | Illinois |
| 76 | John Halverson | 12 | Son | — | Illinois |
| 77 | George Halverson | 7 | Son | — | Illinois |
| 78 | Mary Crummay | 84 | Mother in Law | — | Canada |
| 79 | Willard Casterline | 38 | Head | Salesman | Illinois |
| 80 | Angela Casterline | 34 | Wife | — | Florida |
Related Census Records
Pedigree Summary
Robert
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)